Preeti (Padmini Kolhapure) is a rich girl who falls in love with a middle class photographer Ajay (Mithun Chakraborty). Her parents initially disagree for the marriage but the daughter manages to make them ready for the marriage. Preeti's father Bhanu (Danny Dengzongpa) makes Ajay a top class photographer and his salary gets an increment. Later Ajay discovers that Bhanu has made his promotion and this has hurt his self-respect. Preeti and Ajay separate.

Although Preeti and Ajay both still love each other, Bhanu makes them have a divorce due to misunderstandings caused by him - Bhanu makes Ajay believe Preeti wants a divorce and vice versa. Preeti is then found to be pregnant with Ajay's child. Bhanu doesn't tell this to Ajay, and instead takes Preeti to the mountains (Shimla) for the delivery so that nobody finds that she gave birth to a baby. There in hospital, Bhanu meets Ajay and tells him about the baby. Bhanu agrees to give the baby to Ajay on the basis that Ajay never approach Preeti again, as she wants a new life with a new man. Ajay agrees, but Bhanu later changes his mind and gives the baby to an orphanage. However, Ajay follows him there and takes his own baby from the orphanage.

The story moves forward for some years and Preeti doesn't believe that her baby is dead, slowly losing her mental stability as a result. She carries a doll child in her arms, believing it to be her own son. Her parents get increasingly worried as a result. However, Preeti shows some improvement when she sees a photograph which she clicked in Shimla when she was with Ajay. The parents take her back to Shimla as a result. Ajay lives in Shimla and has brought up his child on his own. In a chance occurring, the child meets Preeti and there is a connection between the two - with the help of Ajay, he later identifies her as his mother. He returns to her and brings her to Ajay and they solve their misunderstandings. The two expose the misunderstandings in their minds caused by Bhanu. They are able to reconcile and express their love for one another and live happily thereafter with their child.

• Mithun Chakraborty ... Ajay Khanna
• Padmini Kolhapure ... Preeti Pratap / Preeti Khanna
• Danny Denzongpa ... Bhanu Pratap
• Bindu ... Kamini Pratap
• Master Vicky ... Vicky Khanna
• Madhu Malini ... Mala Mathur
• Sudha Chopra ... Kamini's sister
• Vikas Anand ... Police Inspector
• Pinchoo Kapoor ... Dwarka Prasad
• Manmohan Krishna ... Mr. Mathur
• Roopesh Kumar ... Rohit Prasad
• Chaman Puri ... Shankar
• Asrani ... Jackie
• Ratna Bhushan

Pyaar Jhukta Nahin movie is a remake of superhit Bollywood movie Aa Gale Lag Jaa. In the year 1977 the story was copied by a super hit Pakistani film Aina. It was remade in Kannada as Nee Bareda Kadambari with Kannada actor Vishnuvardhan and Bhavya in the lead. It was also remade in Tamil with Rajnikant as Naan Adimai Illai co-starring Sridevi. Both remakes were directed by Dwarakish. The film was also remade in Telugu as Pachani Kapuram, again starring Sridevi. In the year 2002, the movie was again remade in Bollywood as Rishtey starring Anil Kapoor, Karishma Kapoor and Shilpa Shetty.